Autoconf is an extensible package of m4 macros that produce shell
scripts to automatically configure software source code packages.
These scripts can adapt the packages to many kinds of UNIX-like
systems without manual user intervention. Autoconf creates a
configuration script for a package from a template file that lists the
operating system features that the package can use, in the form of m4
macro calls.
WWW: http://www.gnu.org/software/autoconf/

Handle an edge-case where lang/gawk is installed prior to any autoconf*
ports, which then results in an implicit dependency on gawk, with the
obvious bad things happening should gawk be later removed.
Note that because this is an edge case, which most folks will not run
into, and because it doesn't change the default package, I am not
bumping PORTREVISION as suggested in the original patch.
PR: 125101
Who: matthias <dot> andree <at> gmx <dot> de

- Set --mandir and --infodir in CONFIGURE_ARGS if the configure script
supports them. This is determined by running ``configure --help'' in
do-configure target and set the shell variable _LATE_CONFIGURE_ARGS
which is then passed to CONFIGURE_ARGS.
- Remove --mandir and --infodir in ports' Makefile where applicable
Few ports use REINPLACE_CMD to achieve the same effect, remove them too.
- Correct some manual pages location from PREFIX/man to MANPREFIX/man
- Define INFO_PATH where necessary
- Document that .info files are installed in a subdirectory relative to
PREFIX/INFO_PATH and slightly change add-plist-info to use INFO_PATH and
subdirectory detection.
PR: ports/111470
Approved by: portmgr
Discussed with: stas (Mk/*), gerald (info related stuffs)
Tested by: pointyhat exp run